Edwabd j



(No Model.)

B. J. MALLETT.

AUTOMATIG POLE GHANGER.

No. 384,326. Patented June 12, 1888'.

INVENTOR j 6 c M .Attorney,

WITNESSES EZwa' 0 %weZZ,

UNITED STATES PATENT OEEIcE.

EDW'ARD J. MALLETT, OF NEYV YORK, Y.

AUTOMATIC POLE-=CHANGER.

SPECIFICATION forming part of Letters Patent 1 To.384,326, dated June 12, 1888,

Serial No, 270,0l'i. (No model.)

To all whom it may concern.-

Be it known that I, EDWARD J. MALLETT, of the city, county, and State of New York, have invented a certain new and useful Improvement in Automatic Pole-Ghangers and Circuits Therefor, of which the following is a specification.

The object of my invention is to insure the certain and efficient operation of an automatic pole-changer with a current of one polarity. To effect this result 1 provide the polarized magnet of the polechanger with two inde pendent and separate windings of such nature that an electric current, when passed through one winding,will impart to the magnet an op posite polarity from that which will be imparted to the magnet when the current is passed through the other winding, and I inelude one winding in a circuit completed through one of the two sets of contacts with which the pole-changer is, as usual, furnished, and the other winding in a circuit in derivation to the one first named and completed through the other set of contacts of the polechanger. The eircuitcom1ections are such that when one circuit is completed through one set of contacts such polarity will be imparted to the magnet as will move its armature in a direction to cause the other circuit to be completed through the other set of contacts. In this way the action of the pole-changer becomes entirely automatic, and it will continue in operation indefinitely.

The accompanying drawing represents a pole-changer and circuit-connections therefor embodying my invention.

A A are the spools of the electro magnet of the pole-changer. B B are their cores, and O is the yoke. These spools are wound with two independent and separate wires or coils, whose terminals are seen at a; and 7, respectively. The windings are such that a current, when passed through as, will impart one polarity to the magnet, and when passed through y will impart an opposite polarity to the magnet. This method of winding or of connecting up two separate coils on the same spool is well known in the art and requires no detailed deseription.

D is the magnetic armature of the magnet. In thisinstance it is supposed to be inductively magnetized, for which purpose it is pivoted to the core E of an electro-magnet which is secured to the yoke O. The spool F of this magnet can be in circuit with any suitable source of electricity.

The cont-acts of the pole-changer are formed in this instance by the two stationary contact points a b and the tongue 0 of the armature D, which plays between the stationary contact points a I), and makes contact with one and the other of them alternately, being provided for this purpose with the two springs or leaves d c. The tongue and the stationary contact a form one set of contacts, and the tongue and the stationary contact 1) form the other set of contacts. This is one well-lnown type ofpolechanging contacts.

The circuit-connections are as follows: From one pole of battery X by wire 1 to the tongue; from the opposite pole of the battery by w re 2,which branches, one branch, 3, connecting winding a; of the magnet A with the stationary contact a, and the other branch, -zt, connecting winding 3 with contact b. The windings and connections, as before stated, are such that when the circuit is completed through one set of contacts such polarity will be imparted to magnet A as will move its armature in a direction to cause circuit to be completed through the opposite set of contacts. Consequently, if we suppose the tongue 0 and eontactpoint a, to be in contact, the circuit will be completed through branch 3 and winding m, with the effect of imparting such polarity to magnet A as to tilt the armature in a direction to bring the tongue into contact with b. This will complete the circuit through the opposite winding 3/ of the magnet and through the branch 4 which is in derivation to 3. Opposite polarity will thereby be imparted to magnet and the armature will be moved in a direction to complete the circuit through the tongue cand contact a, and so on. In this way with a current of one polarity the pole-changer can be con tinued in action indefinitely.

In order to illustrate one of the uses to which the pole-changer can be put, I have represented a polarized escapement whose magnet G is doubly and oppositely wound in the same m y, respectively, included. in a similar mauner in the branches 3 4. Under this arrangechanger, and the other winding included in a ment the escapement will continue in vibracircuit in derivation to the one first named, tion so long as the pole-changer is in operaand completed through the other set of con- I 5 tion'. tacts of the pole-changer, substantially as set 5 Having described my improvement and the forth. manner in which it is or may be carried into In testimony whereof I have hereunto set effect, what I claim herein as-new and of my my hand this 6th day of April, A. D. 1888. own invention is- An automatic pole-changer the magnet of EDWARD MALLETT' 10 which is doubly and oppositely wound, one Witnesses:

winding included in a circuit completed EWELL A. DICK, through one'of the sets of contacts of the pole- MARVIN A. CUsTIs. 

